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If the value of (n + 2) . ""^(n)C(0) ...

If the value of
` (n + 2) . ""^(n)C_(0) *2^(n+1) - (n+1) * ""^(n)C_(1)*2^(n) + n* ""^(n)C_(2) * 2^(n-1) -...`
is equal to k(n +1) , the value of k is .

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4
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